Boiler drum and tube extension



Aug. 7, 1934. H. .1. KERR BOILER DRUM AND TUBE EXTENSION 3 Sheets-Sheet1 Filed Aug. 51 1931 50 6/ Y W J ATTORNEY5 H. J. KERR Aug; 7, 1934.

Filed Aug. 51 1931 IN NTO I W 1 W ATTORNEY Aug. 7, 1934. H. J. KERRBOILER DRUM AND TUBE EXTENSION Filed Aug. 31, 1931 3 Sheets-Sheet 3 yWFQLV .2. 1/604 I W ATTORNEY:

Fatented Aug 7, 1934 UNITED STATES PATENT ounce pom mum AND TUBEEXTENSION Howard J. Kerr, Westfl- N. J.,

The Babcock & Wilcox Company,

. :t of to Bayonne,

This invention relates to a water tube boiler that is provided with asteam and water drum to which tubes carrying a mixture of steam andwater are connected. By this invention the dis- 5 charge ends of watertubes of the boiler proper and also of the furnace wall tubes may beconnected to the steam and water drum in such a manner that the steamand water are separated from each other after the mixture enters thesteam and water drum, the steam entering the steam and water space andthe water entering the water space of the drum.

The invention will be understood from the description in connection withthe accompanying drawings, in which Fig. 1 is a. vertical sectionthrough a boiler and furnace illustrative of the invention; Fig. 2 is asection through the drum on an enlarged scale showing the connection ofthe tubes to the drum; Fig. 3 is a side elevation of one tag of theextensions of the tubes taken along the line 33 of Fig. 2; Fig. 4 is aview similar to Fig. 2

showing a modification; Fig. 5 is a view similar to Fig. 3 taken alongthe line 55 of Fig. 4; Fig. 6

is a section along the line 6-6 of Fig. 4; Fig. 'l is a section similarto Fig. 6 showing a modification;

Figs. 8 and time views similar to Fig. 4 showing other modifications;and. Fig. 10 is a section along the line 10-19 of Fig. 9.

'In the drawings, reference character 1 indicates 5) the furnace of aboiler above which a water tube boiler of the Babcock a Wilcox'type islocated.

The boiler comprises the usual steam and water drum 2 in which thenormal water level is indicated by the line 3. The drum 2 is connectedby nipples 5 to the downtake headers 4 which are in turn connected by abank of inclined tubes 6 to "the uptake headers which are connected bythe circulating tubes 8 to the steam and water 2.

The boiler is provided with the usual bames for directing the hotproducts of combustion from the furnace 1 to the outlet or stack 9.

The furnace is provided with vertically extending water wall tubes 10connected at their upper ends to headers 11 and at their lower ends to 5headers 12. The headers 12 are connected by s": provided with extensions15 that extend from the ends of the tubes 14 into the drum a sumcientdistance so that the lower ends thereof are below the normal water levelin the drum. The extensions 15 are curved intermediate their ends withtheir lower ends preferably parallel to each other. These tubes areprovided with rectangularly shaped openings 16 on the concave side ofthe bent portions of the tubes.

The mixture of steam and water entering the drum 2 through the tubes 8from the boiler 95 proper and through the tubes 14 from the furnace walltubes passes into the extensions 15 and centrifugal force causes thewater to be separated from the steam as the mixture passes through thecurved portion of the extensions 15. The water 70 passes out through thelowerends of the extensions 15 into the water space of the drum 2, whilethe steam passes through the openings 16 into the steam space of thedrum 2.

By providing the extensions 15 the mixture of 7 steam and water enteringthe drum is separated so that comparatively dry steam will be in the"steam space of the steam and water drum.

In the modification shown in Figs. 4, 5 and 6, the extensions 15' areshown as terminating above 30 the normal water level of the drum. Inthis modification each extension 15 is provided on its concave side witha slot 16' that extends from the lower end of the extension to within ashort distance of the inside surface of the drum.

The modification shown in Fig. '7 is the same as that shown in Fig. 6except that the edges of the tube 15' at the slot are bent back, asindicated at 1'7, to prevent water that has been separated from thesteam from being thrown out of the extensions into the steam space ofthe steam and water drum.

In the modification shown in Fig. 8, the ends of the tubes 14 extend ashort distance beyond the inner wall of the drum 2 and are increased indiameter, as indicated at 18. The extensions 19 of these tubes, whichare similar to the extenclone 15', are enlarged and the enlarged endsare welded to the ends of the tubes 14, as indicated at 20.'I'heslots'21in the extensions 19 are simoeasvs curved extensions fromsaid tubes into said drum, said extensions being provided with openingson the inner sides of the curves.

3. In a boiler, a steam and water drum, tubes connected to the steamspace of said drum, and extensions from saidtubes into said drum, saidextensions having their ends below the normal water level in said drumand being provided with openings above the normal water level in saiddrum.

HOWARD J. KERR.

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